sys/dev/netif/sbsh/if_sbsh.c

   1 /**
   2  * Granch SBNI16 G.SHDSL Modem driver
   3  * Written by Denis I. Timofeev, 2002-2003.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/dev/sbsh/if_sbsh.c,v 1.3.2.1 2003/04/15 18:15:07 fjoe Exp $
  27  * $DragonFly: src/sys/dev/netif/sbsh/if_sbsh.c,v 1.23 2005/12/31 14:08:00 sephe Exp $
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/sockio.h>
  33 #include <sys/mbuf.h>
  34 #include <sys/malloc.h>
  35 #include <sys/kernel.h>
  36 #include <sys/proc.h>
  37 #include <sys/socket.h>
  38 #include <sys/random.h>
  39 #include <sys/serialize.h>
  40 #include <sys/thread2.h>
  41
  42 #include <net/if.h>
  43 #include <net/ifq_var.h>
  44 #include <net/if_arp.h>
  45 #include <net/ethernet.h>
  46 #include <net/if_media.h>
  47
  48 #include <net/bpf.h>
  49
  50 #include <vm/vm.h>
  51 #include <vm/pmap.h>
  52 #include <machine/bus.h>
  53 #include <machine/resource.h>
  54 #include <sys/bus.h>
  55 #include <sys/rman.h>
  56
  57 #include <bus/pci/pcireg.h>
  58 #include <bus/pci/pcivar.h>
  59
  60 #include "if_sbshreg.h"
  61
  62 /* -------------------------------------------------------------------------- */
  63
  64 struct sbni16_hw_regs {
  65         u_int8_t  CR, CRB, SR, IMR, CTDR, LTDR, CRDR, LRDR;
  66 };
  67
  68 struct hw_descr {
  69         u_int32_t  address;
  70         u_int32_t  length;
  71 };
  72
  73 struct cx28975_cmdarea {
  74         u_int8_t  intr_host;
  75         u_int8_t  intr_8051;
  76         u_int8_t  map_version;
  77
  78         u_int8_t  in_dest;
  79         u_int8_t  in_opcode;
  80         u_int8_t  in_zero;
  81         u_int8_t  in_length;
  82         u_int8_t  in_csum;
  83         u_int8_t  in_data[75];
  84         u_int8_t  in_datasum;
  85
  86         u_int8_t  out_dest;
  87         u_int8_t  out_opcode;
  88         u_int8_t  out_ack;
  89         u_int8_t  out_length;
  90         u_int8_t  out_csum;
  91         u_int8_t  out_data[75];
  92         u_int8_t  out_datasum;
  93 };
  94
  95 #define XQLEN   8
  96 #define RQLEN   8
  97
  98 struct sbsh_softc {
  99         struct arpcom   arpcom;         /* ethernet common */
 100
 101         struct resource *mem_res;
 102         struct resource *irq_res;
 103         void            *intr_hand;
 104
 105         void            *mem_base;              /* mapped memory address */
 106
 107         volatile struct sbni16_hw_regs  *regs;
 108         volatile struct hw_descr        *tbd;
 109         volatile struct hw_descr        *rbd;
 110         volatile struct cx28975_cmdarea *cmdp;
 111
 112         /* SBNI16 controller statistics */
 113         struct sbni16_stats {
 114                 u_int32_t  sent_pkts, rcvd_pkts;
 115                 u_int32_t  crc_errs, ufl_errs, ofl_errs, attempts, last_time;
 116         } in_stats;
 117
 118         /* transmit and reception queues */
 119         struct mbuf     *xq[XQLEN], *rq[RQLEN];
 120         unsigned        head_xq, tail_xq, head_rq, tail_rq;
 121
 122         /* the descriptors mapped onto the first buffers in xq and rq */
 123         unsigned        head_tdesc, head_rdesc;
 124         u_int8_t        state;
 125 };
 126
 127 struct cx28975_cfg {
 128         u_int8_t   *firmw_image;
 129         u_int32_t  firmw_len;
 130         u_int32_t  lrate: 10;
 131         u_int32_t  master: 1;
 132         u_int32_t  mod: 2;
 133         u_int32_t  crc16: 1;
 134         u_int32_t  fill_7e: 1;
 135         u_int32_t  inv: 1;
 136         u_int32_t  rburst: 1;
 137         u_int32_t  wburst: 1;
 138         u_int32_t  : 14;
 139 };
 140
 141 /* SHDSL transceiver statistics */
 142 struct dsl_stats {
 143         u_int8_t        status_1, status_3;
 144         u_int8_t        attenuat, nmr, tpbo, rpbo;
 145         u_int16_t       losw, segd, crc, sega, losd;
 146 };
 147
 148 enum State { NOT_LOADED, DOWN, ACTIVATION, ACTIVE };
 149
 150 #define SIOCLOADFIRMW   _IOWR('i', 67, struct ifreq)
 151 #define SIOCGETSTATS    _IOWR('i', 68, struct ifreq)
 152 #define SIOCCLRSTATS    _IOWR('i', 69, struct ifreq)
 153
 154 static int      sbsh_probe(device_t);
 155 static int      sbsh_attach(device_t);
 156 static int      sbsh_detach(device_t);
 157 static int      sbsh_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
 158 static void     sbsh_shutdown(device_t);
 159 static int      sbsh_suspend(device_t);
 160 static int      sbsh_resume(device_t);
 161 static void     sbsh_watchdog(struct ifnet *);
 162
 163 static void     sbsh_start(struct ifnet *);
 164 static void     sbsh_init(void *);
 165 static void     sbsh_stop(struct sbsh_softc *);
 166 static void     init_card(struct sbsh_softc *);
 167 static void     sbsh_intr(void *);
 168 static void     resume_tx(struct sbsh_softc *);
 169 static void     start_xmit_frames(struct sbsh_softc *);
 170 static void     encap_frame(struct sbsh_softc *, struct mbuf *);
 171 static struct mbuf *    repack(struct sbsh_softc *, struct mbuf *);
 172 static void     free_sent_buffers(struct sbsh_softc *);
 173 static void     alloc_rx_buffers(struct sbsh_softc *);
 174 static void     indicate_frames(struct sbsh_softc *);
 175 static void     drop_queues(struct sbsh_softc *);
 176 static void     activate(struct sbsh_softc *);
 177 static void     deactivate(struct sbsh_softc *);
 178 static void     cx28975_interrupt(struct sbsh_softc *);
 179 static int      start_cx28975(struct sbsh_softc *, struct cx28975_cfg);
 180 static int      download_firmware(struct sbsh_softc *, u_int8_t *, u_int32_t);
 181 static int      issue_cx28975_cmd(struct sbsh_softc *, u_int8_t,
 182                                         u_int8_t *, u_int8_t);
 183
 184 static device_method_t sbsh_methods[] = {
 185         /* Device interface */
 186         DEVMETHOD(device_probe,         sbsh_probe),
 187         DEVMETHOD(device_attach,        sbsh_attach),
 188         DEVMETHOD(device_detach,        sbsh_detach),
 189         DEVMETHOD(device_shutdown,      sbsh_shutdown),
 190         DEVMETHOD(device_suspend,       sbsh_suspend),
 191         DEVMETHOD(device_resume,        sbsh_resume),
 192
 193         { 0, 0 }
 194 };
 195
 196 static driver_t sbsh_driver = {
 197         "sbsh",
 198         sbsh_methods,
 199         sizeof(struct sbsh_softc)
 200 };
 201
 202 static devclass_t sbsh_devclass;
 203
 204 DECLARE_DUMMY_MODULE(if_sbsh);
 205 DRIVER_MODULE(if_sbsh, pci, sbsh_driver, sbsh_devclass, 0, 0);
 206
 207 static int
 208 sbsh_probe(device_t dev)
 209 {
 210         if (pci_get_vendor(dev) != SBNI16_VENDOR
 211             || pci_get_device(dev) != SBNI16_DEVICE
 212             || pci_get_subdevice(dev) != SBNI16_SUBDEV)
 213                 return (ENXIO);
 214
 215         device_set_desc(dev, "Granch SBNI16 G.SHDSL Modem");
 216         return (0);
 217 }
 218
 219 static int
 220 sbsh_attach(device_t dev)
 221 {
 222         struct sbsh_softc       *sc;
 223         struct ifnet            *ifp;
 224         int                     unit, error = 0, rid;
 225
 226         sc = device_get_softc(dev);
 227         unit = device_get_unit(dev);
 228
 229         rid = PCIR_MAPS + 4;
 230         sc->mem_res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
 231                                         0, ~0, 4096, RF_ACTIVE);
 232
 233         if (sc->mem_res == NULL) {
 234                 printf ("sbsh%d: couldn't map memory\n", unit);
 235                 error = ENXIO;
 236                 goto fail;
 237         }
 238
 239         rid = 0;
 240         sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
 241             RF_SHAREABLE | RF_ACTIVE);
 242
 243         if (sc->irq_res == NULL) {
 244                 printf("sbsh%d: couldn't map interrupt\n", unit);
 245                 error = ENXIO;
 246                 goto fail;
 247         }
 248
 249         sc->mem_base = rman_get_virtual(sc->mem_res);
 250         init_card(sc);
 251         /* generate ethernet MAC address */
 252         *(u_int32_t *)sc->arpcom.ac_enaddr = htonl(0x00ff0192);
 253         read_random_unlimited(sc->arpcom.ac_enaddr + 4, 2);
 254
 255         ifp = &sc->arpcom.ac_if;
 256         ifp->if_softc = sc;
 257         if_initname(ifp, "sbsh", unit);
 258         ifp->if_mtu = ETHERMTU;
 259         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 260         ifp->if_ioctl = sbsh_ioctl;
 261         ifp->if_start = sbsh_start;
 262         ifp->if_watchdog = sbsh_watchdog;
 263         ifp->if_init = sbsh_init;
 264         ifp->if_baudrate = 4600000;
 265         ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN);
 266         ifq_set_ready(&ifp->if_snd);
 267
 268         ether_ifattach(ifp, sc->arpcom.ac_enaddr, NULL);
 269
 270         error = bus_setup_intr(dev, sc->irq_res, INTR_NETSAFE,
 271                                 sbsh_intr, sc, &sc->intr_hand,
 272                                 ifp->if_serializer);
 273         if (error) {
 274                 ether_ifdetach(ifp);
 275                 printf("sbsh%d: couldn't set up irq\n", unit);
 276                 goto fail;
 277         }
 278
 279         return(0);
 280
 281 fail:
 282         sbsh_detach(dev);
 283         return (error);
 284 }
 285
 286 static int
 287 sbsh_detach(device_t dev)
 288 {
 289         struct sbsh_softc *sc = device_get_softc(dev);
 290         struct ifnet *ifp = &sc->arpcom.ac_if;
 291
 292         if (device_is_attached(dev)) {
 293                 lwkt_serialize_enter(ifp->if_serializer);
 294                 sbsh_stop(sc);
 295                 bus_teardown_intr(dev, sc->irq_res, sc->intr_hand);
 296                 lwkt_serialize_exit(ifp->if_serializer);
 297
 298                 ether_ifdetach(ifp);
 299         }
 300
 301         if (sc->irq_res)
 302                 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->irq_res);
 303         if (sc->mem_res) {
 304                 bus_release_resource(dev, SYS_RES_MEMORY, PCIR_MAPS + 4,
 305                                      sc->mem_res);
 306         }
 307
 308         return (0);
 309 }
 310
 311
 312 static void
 313 sbsh_start(struct ifnet *ifp)
 314 {
 315         struct sbsh_softc  *sc = ifp->if_softc;
 316
 317         if (sc->state == ACTIVE)
 318                 start_xmit_frames(ifp->if_softc);
 319 }
 320
 321
 322 static void
 323 sbsh_init(void *xsc)
 324 {
 325         struct sbsh_softc       *sc = xsc;
 326         struct ifnet            *ifp = &sc->arpcom.ac_if;
 327         u_int8_t                t;
 328
 329         if ((ifp->if_flags & IFF_RUNNING) || sc->state == NOT_LOADED) {
 330                 return;
 331         }
 332
 333         bzero(&sc->in_stats, sizeof(struct sbni16_stats));
 334         sc->head_xq = sc->tail_xq = sc->head_rq = sc->tail_rq = 0;
 335         sc->head_tdesc = sc->head_rdesc = 0;
 336
 337         sc->regs->IMR = EXT;
 338         t = 2;
 339         issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1);
 340         if (issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1) == 0) {
 341                 sc->state = ACTIVATION;
 342
 343                 ifp->if_flags |= IFF_RUNNING;
 344                 ifp->if_flags &= ~IFF_OACTIVE;
 345         }
 346 }
 347
 348
 349 static void
 350 sbsh_stop(struct sbsh_softc *sc)
 351 {
 352         u_int8_t  t;
 353
 354         sc->regs->IMR = EXT;
 355
 356         t = 0;
 357         issue_cx28975_cmd(sc, _DSL_ACTIVATION, &t, 1);
 358         if (sc->state == ACTIVE) {
 359                 t = 1;
 360                 issue_cx28975_cmd(sc, _DSL_FORCE_DEACTIVATE, &t, 1);
 361                 /* FIX! activation manager state */
 362
 363                 /* Is it really must be done here? It calls from intr handler */
 364                 deactivate(sc);
 365         }
 366
 367         sc->regs->IMR = 0;
 368         sc->state = DOWN;
 369 }
 370
 371
 372 static void
 373 init_card(struct sbsh_softc *sc)
 374 {
 375         sc->state = NOT_LOADED;
 376         sc->tbd  = (struct hw_descr *) sc->mem_base;
 377         sc->rbd  = (struct hw_descr *) ((u_int8_t *)sc->mem_base + 0x400);
 378         sc->regs = (struct sbni16_hw_regs *) ((u_int8_t *)sc->mem_base + 0x800);
 379         sc->cmdp = (struct cx28975_cmdarea *) ((u_int8_t *)sc->mem_base + 0xc00);
 380
 381         sc->regs->CR = 0;
 382         sc->regs->SR = 0xff;
 383         sc->regs->IMR = 0;
 384 }
 385
 386
 387 static int
 388 sbsh_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 389 {
 390         struct sbsh_softc       *sc = ifp->if_softc;
 391         struct ifreq            *ifr = (struct ifreq *) data;
 392         struct cx28975_cfg      cfg;
 393         struct dsl_stats        ds;
 394         int                     error = 0;
 395         u_int8_t                t;
 396
 397         switch(cmd) {
 398         case SIOCLOADFIRMW:
 399                 if ((error = suser_cred(cr, NULL_CRED_OKAY)) != 0)
 400                         break;
 401                 if (ifp->if_flags & IFF_UP)
 402                         error = EBUSY;
 403
 404                 bcopy((caddr_t)ifr->ifr_data, (caddr_t)&cfg, sizeof cfg);
 405                 if (start_cx28975(sc, cfg) == 0) {
 406                         static char  *modstr[] = {
 407                                 "TCPAM32", "TCPAM16", "TCPAM8", "TCPAM4" };
 408                         if_printf(&sc->arpcom.ac_if, "%s, rate %d, %s\n",
 409                                 cfg.master ? "master" : "slave",
 410                                 cfg.lrate << 3, modstr[cfg.mod]);
 411                 } else {
 412                         if_printf(&sc->arpcom.ac_if,
 413                                 "unable to load firmware\n");
 414                         error = EIO;
 415                 }
 416                 break;
 417
 418         case  SIOCGETSTATS :
 419                 if ((error = suser_cred(cr, NULL_CRED_OKAY)) != 0)
 420                         break;
 421
 422                 t = 0;
 423                 if (issue_cx28975_cmd(sc, _DSL_FAR_END_ATTEN, &t, 1))
 424                         error = EIO;
 425                 ds.attenuat = sc->cmdp->out_data[0];
 426
 427                 if (issue_cx28975_cmd(sc, _DSL_NOISE_MARGIN, &t, 1))
 428                         error = EIO;
 429                 ds.nmr = sc->cmdp->out_data[0];
 430
 431                 if (issue_cx28975_cmd(sc, _DSL_POWER_BACK_OFF_RESULT, &t, 1))
 432                         error = EIO;
 433                 ds.tpbo = sc->cmdp->out_data[0];
 434                 ds.rpbo = sc->cmdp->out_data[1];
 435
 436                 if (!issue_cx28975_cmd(sc, _DSL_HDSL_PERF_ERR_CTRS, &t, 1)) {
 437                         int i;
 438                         for (i = 0; i < 10; ++i)
 439                                 ((u_int8_t *) &ds.losw)[i] =
 440                                         sc->cmdp->out_data[i];
 441                 } else
 442                         error = EIO;
 443
 444                 ds.status_1 = ((volatile u_int8_t *)sc->cmdp)[0x3c0];
 445                 ds.status_3 = ((volatile u_int8_t *)sc->cmdp)[0x3c2];
 446
 447                 bcopy(&sc->in_stats, ifr->ifr_data, sizeof(struct sbni16_stats));
 448                 bcopy(&ds, (char *)ifr->ifr_data + sizeof(struct sbni16_stats),
 449                     sizeof(struct dsl_stats));
 450                 break;
 451
 452         case  SIOCCLRSTATS :
 453                 if (!(error = suser_cred(cr, NULL_CRED_OKAY))) {
 454                         bzero(&sc->in_stats, sizeof(struct sbni16_stats));
 455                         t = 2;
 456                         if (issue_cx28975_cmd(sc, _DSL_CLEAR_ERROR_CTRS, &t, 1))
 457                                 error = EIO;
 458                 }
 459                 break;
 460         case SIOCSIFFLAGS:
 461                 if (ifp->if_flags & IFF_UP) {
 462                         if (!(ifp->if_flags & IFF_RUNNING)) {
 463                                 if (sc->state == NOT_LOADED) {
 464                                         if_printf(ifp, "firmware wasn't loaded\n");
 465                                         error = EBUSY;
 466                                 } else
 467                                         sbsh_init(sc);
 468                         }
 469                 } else {
 470                         if (ifp->if_flags & IFF_RUNNING) {
 471                                 sbsh_stop(sc);
 472                                 ifp->if_flags &= ~IFF_RUNNING;
 473                         }
 474                 }
 475                 break;
 476
 477         case SIOCADDMULTI:
 478         case SIOCDELMULTI:
 479                 error = 0;
 480                 break;
 481         default:
 482                 error = ether_ioctl(ifp, cmd, data);
 483                 break;
 484         }
 485         return (error);
 486 }
 487
 488
 489 static void
 490 sbsh_shutdown(device_t dev)
 491 {
 492         struct sbsh_softc       *sc = device_get_softc(dev);
 493
 494         lwkt_serialize_enter(sc->arpcom.ac_if.if_serializer);
 495         sbsh_stop(sc);
 496         lwkt_serialize_exit(sc->arpcom.ac_if.if_serializer);
 497 }
 498
 499 static int
 500 sbsh_suspend(device_t dev)
 501 {
 502         struct sbsh_softc *sc = device_get_softc(dev);
 503
 504         lwkt_serialize_enter(sc->arpcom.ac_if.if_serializer);
 505         sbsh_stop(sc);
 506         lwkt_serialize_exit(sc->arpcom.ac_if.if_serializer);
 507
 508         return (0);
 509 }
 510
 511 static int
 512 sbsh_resume(device_t dev)
 513 {
 514         struct sbsh_softc *sc = device_get_softc(dev);
 515         struct ifnet *ifp = &sc->arpcom.ac_if;
 516
 517         if (ifp->if_flags & IFF_UP)
 518                 sbsh_init(sc);
 519
 520         return (0);
 521 }
 522
 523
 524 static void
 525 sbsh_watchdog(struct ifnet *ifp)
 526 {
 527         struct sbsh_softc       *sc = ifp->if_softc;
 528
 529         if_printf(ifp, "transmit timeout\n");
 530
 531         if (sc->regs->SR & TXS) {
 532                 sc->regs->SR = TXS;
 533                 if_printf(ifp, "interrupt posted but not delivered\n");
 534         }
 535         free_sent_buffers(sc);
 536 }
 537
 538 /* -------------------------------------------------------------------------- */
 539
 540 static void
 541 sbsh_intr(void *arg)
 542 {
 543         struct sbsh_softc  *sc = (struct sbsh_softc *)arg;
 544         u_int8_t  status = sc->regs->SR;
 545
 546         if (status == 0)
 547                 return;
 548
 549         if (status & EXT) {
 550                 cx28975_interrupt(sc);
 551                 sc->regs->SR = EXT;
 552         }
 553
 554         if (status & UFL) {
 555                 resume_tx(sc);
 556                 sc->regs->SR = UFL;
 557                 ++sc->in_stats.ufl_errs;
 558                 ++sc->arpcom.ac_if.if_oerrors;
 559         }
 560
 561         if (status & RXS) {
 562                 sc->regs->SR = RXS;
 563                 indicate_frames(sc);
 564                 alloc_rx_buffers(sc);
 565         }
 566
 567         if (status & TXS) {
 568                 sc->regs->SR = TXS;
 569                 free_sent_buffers(sc);
 570         }
 571
 572         if (status & CRC) {
 573                 ++sc->in_stats.crc_errs;
 574                 ++sc->arpcom.ac_if.if_ierrors;
 575                 sc->regs->SR = CRC;
 576         }
 577
 578         if (status & OFL) {
 579                 ++sc->in_stats.ofl_errs;
 580                 ++sc->arpcom.ac_if.if_ierrors;
 581                 sc->regs->SR = OFL;
 582         }
 583 }
 584
 585 /*
 586  * Look for a first descriptor of a next packet, and write it's number
 587  * into CTDR. Then enable the transmitter.
 588  */
 589 static void
 590 resume_tx(struct sbsh_softc *sc)
 591 {
 592         u_int32_t       cur_tbd = sc->regs->CTDR;
 593
 594         while (cur_tbd != sc->regs->LTDR
 595                 && (sc->tbd[cur_tbd++].length & LAST_FRAG) == 0)
 596                 ;
 597         sc->regs->CTDR = cur_tbd;
 598         sc->regs->CR |= TXEN;
 599 }
 600
 601 static void
 602 start_xmit_frames(struct sbsh_softc *sc)
 603 {
 604         struct ifnet    *ifp = &sc->arpcom.ac_if;
 605         struct mbuf     *m;
 606
 607         /*
 608          * Check if we have any free descriptor(s) and free space in
 609          * our transmit queue.
 610          */
 611         while (sc->tail_xq != ((sc->head_xq - 1) & (XQLEN - 1))
 612             && sc->regs->LTDR != ((sc->head_tdesc - 1) & 0x7f)) {
 613
 614                 m = ifq_dequeue(&ifp->if_snd, NULL);
 615                 if (m == NULL)
 616                         break;
 617                 if (m->m_pkthdr.len) {
 618                         BPF_MTAP(ifp, m);
 619                         encap_frame(sc, m);
 620                 } else
 621                         m_freem(m);
 622         }
 623
 624         if (sc->regs->CTDR != sc->regs->LTDR)
 625                 ifp->if_flags |= IFF_OACTIVE;
 626         else
 627                 ifp->if_flags &= ~IFF_OACTIVE;
 628 }
 629
 630
 631 static void
 632 encap_frame(struct sbsh_softc *sc, struct mbuf *m_head)
 633 {
 634         struct mbuf     *m;
 635         u_int32_t       cur_tbd;
 636         int  done;
 637
 638 look_for_nonzero:
 639         for (m = m_head; !m->m_len; m = m->m_next)
 640                 ;
 641
 642         cur_tbd = sc->regs->LTDR & 0x7f;
 643         done = 0;
 644         do {
 645                 if (m->m_len < 5 || cur_tbd == ((sc->head_tdesc - 1) & 0x7f)) {
 646                         if ((m_head = repack(sc, m_head)) != NULL)
 647                                 goto look_for_nonzero;
 648                         else
 649                                 return;
 650                 }
 651
 652                 sc->tbd[cur_tbd].address = vtophys(mtod(m, vm_offset_t));
 653                 sc->tbd[cur_tbd].length  = m->m_len;
 654
 655                 do {
 656                         m = m->m_next;
 657                 } while (m && !m->m_len);
 658
 659                 if (!m) {       /* last fragment has been reached */
 660                         sc->tbd[cur_tbd].length |= LAST_FRAG;
 661                         done = 1;
 662                 }
 663
 664                 ++cur_tbd;
 665                 cur_tbd &= 0x7f;
 666         } while (!done);
 667
 668         sc->xq[sc->tail_xq++] = m_head;
 669         sc->tail_xq &= (XQLEN - 1);
 670
 671         sc->regs->LTDR = cur_tbd;
 672         ++sc->in_stats.sent_pkts;
 673         ++sc->arpcom.ac_if.if_opackets;
 674 }
 675
 676 static struct mbuf *
 677 repack(struct sbsh_softc *sc, struct mbuf *m)
 678 {
 679         struct mbuf  *m_new;
 680
 681         MGETHDR(m_new, MB_DONTWAIT, MT_DATA);
 682         if (!m_new) {
 683                 if_printf (&sc->arpcom.ac_if,
 684                            "unable to get mbuf.\n");
 685                 return (NULL);
 686         }
 687
 688         if (m->m_pkthdr.len > MHLEN) {
 689                 MCLGET(m_new, MB_DONTWAIT);
 690                 if (!(m_new->m_flags & M_EXT)) {
 691                         m_freem(m_new);
 692                         if_printf (&sc->arpcom.ac_if,
 693                                    "unable to get mbuf cluster.\n");
 694                         return (NULL);
 695                 }
 696         }
 697
 698         m_copydata(m, 0, m->m_pkthdr.len, mtod(m_new, caddr_t));
 699         m_new->m_pkthdr.len = m_new->m_len = m->m_pkthdr.len;
 700         m_freem(m);
 701         return (m_new);
 702 }
 703
 704 static void
 705 free_sent_buffers(struct sbsh_softc *sc)
 706 {
 707         u_int32_t  cur_tbd;
 708
 709         cur_tbd = sc->regs->CTDR;
 710
 711         while (sc->head_tdesc != cur_tbd) {
 712                 /*
 713                  * Be careful! one element in xq may correspond to
 714                  * multiple descriptors.
 715                  */
 716                 if (sc->tbd[sc->head_tdesc].length & LAST_FRAG) {
 717                         m_freem(sc->xq[sc->head_xq++]);
 718                         sc->head_xq &= (XQLEN - 1);
 719                 }
 720
 721                 sc->tbd[sc->head_tdesc].length = 0;
 722                 sc->head_tdesc = (sc->head_tdesc + 1) & 0x7f;
 723         }
 724
 725         start_xmit_frames(sc);
 726 }
 727
 728 /*
 729  * DON'T use free_sent_buffers to drop the queue!
 730  */
 731 static void
 732 alloc_rx_buffers(struct sbsh_softc *sc)
 733 {
 734         unsigned        cur_rbd = sc->regs->LRDR & 0x7f;
 735         struct mbuf     *m;
 736
 737         while (sc->tail_rq != ((sc->head_rq - 1) & (RQLEN - 1))) {
 738                 MGETHDR(m, MB_DONTWAIT, MT_DATA);
 739                 if (!m) {
 740                         if_printf (&sc->arpcom.ac_if,
 741                                    "unable to get mbuf.\n");
 742                         return;
 743                 }
 744
 745                 if (SBNI16_MAX_FRAME > MHLEN) {
 746                         MCLGET(m, MB_DONTWAIT);
 747                         if (!(m->m_flags & M_EXT)) {
 748                                 m_freem(m);
 749                                 if_printf (&sc->arpcom.ac_if,
 750                                            "unable to get mbuf cluster.\n");
 751                                 return;
 752                         }
 753                         m->m_pkthdr.len = m->m_len = MCLBYTES;
 754                 }
 755
 756                 m_adj(m, 2);    /* align ip on longword boundaries */
 757
 758                 sc->rq[sc->tail_rq++] = m;
 759                 sc->tail_rq &= (RQLEN - 1);
 760
 761                 sc->rbd[cur_rbd].address = vtophys(mtod(m, vm_offset_t));
 762                 sc->rbd[cur_rbd].length  = 0;
 763                 sc->regs->LRDR = cur_rbd = (cur_rbd + 1) & 0x7f;
 764         }
 765 }
 766
 767 static void
 768 indicate_frames(struct sbsh_softc *sc)
 769 {
 770         struct ifnet *ifp = &sc->arpcom.ac_if;
 771         unsigned  cur_rbd = sc->regs->CRDR & 0x7f;
 772
 773         while (sc->head_rdesc != cur_rbd) {
 774                 struct mbuf  *m = sc->rq[sc->head_rq++];
 775                 sc->head_rq &= (RQLEN - 1);
 776
 777                 m->m_pkthdr.len = m->m_len =
 778                                 sc->rbd[sc->head_rdesc].length & 0x7ff;
 779                 m->m_pkthdr.rcvif = ifp;
 780
 781                 ifp->if_input(ifp, m);
 782                 ++sc->in_stats.rcvd_pkts;
 783                 ++ifp->if_ipackets;
 784
 785                 sc->head_rdesc = (sc->head_rdesc + 1) & 0x7f;
 786         }
 787 }
 788
 789 static void
 790 drop_queues(struct sbsh_softc *sc)
 791 {
 792         while (sc->head_rq != sc->tail_rq) {
 793                 m_freem(sc->rq[sc->head_rq++]);
 794                 sc->head_rq &= (RQLEN - 1);
 795         }
 796
 797         while (sc->head_xq != sc->tail_xq) {
 798                 m_freem(sc->xq[sc->head_xq++]);
 799                 sc->head_xq &= (XQLEN - 1);
 800         }
 801 }
 802
 803 /* -------------------------------------------------------------------------- */
 804
 805 static void
 806 activate(struct sbsh_softc *sc)
 807 {
 808         struct timeval  tv;
 809
 810         sc->regs->SR   = 0xff;          /* clear it! */
 811         sc->regs->CTDR = sc->regs->LTDR = sc->regs->CRDR = sc->regs->LRDR = 0;
 812
 813         sc->head_tdesc = sc->head_rdesc = 0;
 814         alloc_rx_buffers(sc);
 815
 816         sc->regs->CRB &= ~RXDE;
 817         sc->regs->IMR = EXT | RXS | TXS | CRC | OFL | UFL;
 818         sc->regs->CR |= TXEN | RXEN;
 819
 820         sc->state = ACTIVE;
 821         ++sc->in_stats.attempts;
 822         microtime(&tv);
 823         sc->in_stats.last_time = tv.tv_sec;
 824         start_xmit_frames(sc);
 825 }
 826
 827 static void
 828 deactivate(struct sbsh_softc *sc)
 829 {
 830         sc->regs->CR &= ~(RXEN | TXEN);
 831         sc->regs->CRB |= RXDE;
 832         sc->regs->IMR  = EXT;
 833         sc->regs->CTDR = sc->regs->LTDR;
 834         sc->regs->CRDR = sc->regs->LRDR;
 835         sc->state = ACTIVATION;
 836
 837         drop_queues(sc);
 838 }
 839
 840 /* -------------------------------------------------------------------------- */
 841
 842 static void
 843 cx28975_interrupt(struct sbsh_softc *sc)
 844 {
 845         volatile struct cx28975_cmdarea  *p = sc->cmdp;
 846         u_int8_t  t;
 847
 848         if (p->intr_host != 0xfe)
 849                 return;
 850
 851         if (p->out_ack & 0x80) {
 852                 if (*((volatile u_int8_t *)p + 0x3c7) & 2) {
 853                         if (sc->state != ACTIVE
 854                             && (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) == 0x40) {
 855                                 activate(sc);
 856                                 if_printf(&sc->arpcom.ac_if, "connected to peer\n");
 857                         } else if (sc->state == ACTIVE
 858                                  && (*((volatile u_int8_t *)p + 0x3c0) & 0xc0) != 0x40) {
 859                                 deactivate(sc);
 860                                 if_printf(&sc->arpcom.ac_if, "carrier lost\n");
 861                         }
 862                 }
 863
 864                 p->intr_host = 0;
 865                 t = p->intr_host;
 866                 p->out_ack = 0;
 867         } else {
 868                 wakeup(sc);
 869
 870                 p->intr_host = 0;
 871                 t = p->intr_host;
 872         }
 873 }
 874
 875 /* -------------------------------------------------------------------------- */
 876
 877 static int
 878 start_cx28975(struct sbsh_softc *sc, struct cx28975_cfg cfg)
 879 {
 880         static char  thresh[] = { +8, -4, -16, -40 };
 881
 882         volatile struct cx28975_cmdarea  *p = sc->cmdp;
 883         u_int8_t  t, parm[12];
 884
 885         p->intr_host = 0;
 886         t = p->intr_host;
 887
 888         /* reset chip set */
 889         sc->regs->IMR = EXT;
 890         sc->regs->CR  = 0;
 891         sc->regs->SR  = 0xff;
 892         DELAY(2);
 893         sc->regs->CR = XRST;
 894         if (cfg.crc16)
 895                 sc->regs->CR |= CMOD;
 896         if (cfg.fill_7e)
 897                 sc->regs->CR |= FMOD;
 898         if (cfg.inv)
 899                 sc->regs->CR |= PMOD;
 900
 901         sc->regs->CRB |= RODD | RXDE;
 902         if (cfg.rburst)
 903                 sc->regs->CRB |= RDBE;
 904         if (cfg.wburst)
 905                 sc->regs->CRB |= WTBE;
 906
 907         tsleep(sc, 0, "sbsh", 0);
 908         if ((p->out_ack & 0x1f) != _ACK_BOOT_WAKE_UP)
 909                 return (-1);
 910
 911         if (download_firmware(sc, cfg.firmw_image, cfg.firmw_len))
 912                 return (-1);
 913
 914         tsleep(sc, 0, "sbsh", 0);
 915         if ((p->out_ack & 0x1f) != _ACK_OPER_WAKE_UP)
 916                 return (-1);
 917
 918         t = cfg.master ? 1 : 9;
 919         if (issue_cx28975_cmd(sc, _DSL_SYSTEM_ENABLE, &t, 1))
 920                 return (-1);
 921
 922         t = 0x63;
 923         if (issue_cx28975_cmd(sc, _DSL_SYSTEM_CONFIG, &t, 1))
 924                 return (-1);
 925
 926         *(u_int16_t *)parm = cfg.lrate >> 3;
 927         parm[2] = parm[3] = parm[0];
 928         parm[5] = cfg.lrate & 7;
 929         parm[4] = parm[7] = 1;
 930         parm[6] = 0;
 931         if (issue_cx28975_cmd(sc, _DSL_MULTI_RATE_CONFIG, parm, 8))
 932                 return (-1);
 933
 934         parm[0] = 0x02 | (cfg.mod << 4);
 935         parm[1] = 0;
 936         if (issue_cx28975_cmd(sc, _DSL_TRAINING_MODE, parm, 2))
 937                 return (-1);
 938
 939         bzero(parm, 12);
 940         parm[0] = 0x04;         /* pre-activation: G.hs */
 941         parm[4] = 0x04;         /* no remote configuration */
 942         parm[7] = 0x01;         /* annex A (default) */
 943         parm[8] = 0xff;         /* i-bit mask (all bits) */
 944         if (issue_cx28975_cmd(sc, _DSL_PREACTIVATION_CFG, parm, 12))
 945                 return (-1);
 946
 947         parm[0] = 0x03;         /* dying gasp time - 3 frames */
 948         parm[1] = thresh[cfg.mod];
 949         parm[2] = 0xff;         /* attenuation */
 950         parm[3] = 0x04;         /* line probe NMR (+2 dB) */
 951         parm[4] = 0x00;         /* reserved */
 952         parm[5] = 0x00;
 953         if (issue_cx28975_cmd(sc, _DSL_THRESHOLDS, parm, 6))
 954                 return (-1);
 955
 956         t = cfg.master ? 0x23 : 0x21;
 957         if (issue_cx28975_cmd(sc, _DSL_FR_PCM_CONFIG, &t, 1))
 958                 return (-1);
 959
 960         t = 0x02;
 961         if (issue_cx28975_cmd(sc, _DSL_INTR_HOST_MASK, &t, 1))
 962                 return (-1);
 963
 964         sc->state = DOWN;
 965         return (0);
 966 }
 967
 968 static int
 969 download_firmware(struct sbsh_softc *sc, u_int8_t *img, u_int32_t img_len)
 970 {
 971         u_int32_t       t;
 972         int             i;
 973         u_int8_t        cksum = 0;
 974
 975         for (i = 0; i < img_len; ++i)
 976                 cksum += img[i];
 977
 978         t = img_len;
 979         if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_START, (u_int8_t *) &t, 4))
 980                 return (-1);
 981
 982         for (i = 0; img_len >= 75; i += 75, img_len -= 75) {
 983                 if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, 75))
 984                         return (-1);
 985         }
 986
 987         if (img_len
 988             &&  issue_cx28975_cmd(sc, _DSL_DOWNLOAD_DATA, img + i, img_len))
 989                 return (-1);
 990
 991         t = (cksum ^ 0xff) + 1;
 992         if (issue_cx28975_cmd(sc, _DSL_DOWNLOAD_END, (u_int8_t *) &t, 1))
 993                 return (-1);
 994
 995         return (0);
 996 }
 997
 998 static int
 999 issue_cx28975_cmd(struct sbsh_softc *sc, u_int8_t cmd,
1000                         u_int8_t *data, u_int8_t size)
1001 {
1002         volatile struct cx28975_cmdarea  *p = sc->cmdp;
1003         u_int8_t  *databuf = p->in_data;
1004         int  i;
1005
1006         u_int8_t  cksum = 0;
1007
1008         p->in_dest      = 0xf0;
1009         p->in_opcode    = cmd;
1010         p->in_zero      = 0;
1011         p->in_length    = --size;
1012         p->in_csum      = 0xf0 ^ cmd ^ size ^ 0xaa;
1013
1014         for (i = 0; i <= size; ++i) {
1015                 cksum ^= *data;
1016                 *databuf++ = *data++;   /* only 1 byte per cycle! */
1017         }
1018
1019         p->in_datasum   = cksum ^ 0xaa;
1020         p->out_ack      = _ACK_NOT_COMPLETE;
1021         p->intr_8051    = 0xfe;
1022
1023         if (tsleep(sc, 0, "sbsh", hz << 3))
1024                 return (-1);
1025
1026         while (p->out_ack == _ACK_NOT_COMPLETE)
1027                 ;                                       /* FIXME ! */
1028
1029         if ((p->out_ack & 0x1f) == _ACK_PASS) {
1030                 p->out_ack = 0;
1031                 return (0);
1032         } else {
1033                 p->out_ack = 0;
1034                 return (-1);
1035         }
1036 }